Remove standalone clang from PATH

Use the clang in Visual Studio. Recommended in
actions/runner-images#10001 (comment).

Author: wantehchang

.github/workflows/ci-windows.yml

@@ -45,6 +45,8 @@ jobs:
         codec-dav1d: 'LOCAL'
         codec-rav1e: 'LOCAL'
 
+    - name: Remove standalone clang from PATH
+      run: $env:PATH = ($env:PATH -split ';' | Where-Object { $_ -ne 'C:\Program Files\LLVM\bin' }) -join ';'
     - name: Build aom
       if: steps.setup.outputs.ext-cache-hit != 'true'
       working-directory: ./ext